VEHICLE PREPARATION
1.Park the vehicle on a level surface and prevent movement by means other than the brakes.
2.Drain all reservoirs to 0 p.s.i. (0 kPa).
LOCATING AD-4™AIR DRYER ON VEHICLE
1.The AD-4™air dryer must be mounted vertically (purge exhaust toward road surface) outside the engine compartment in an area of air flow while the vehicle is in motion. The AD-4™air dryer must not be exposed to direct wheel splash (located behind axle mud flap is acceptable).
2.Locate the AD-4™air dryer as close to the first (supply) reservoir as possible.
3.Do not locate the AD-4™air dryer near heat producing components such as the vehicle exhaust and make certain adequate clearance from moving components (e.g. drive shaft, suspension, pitman arm, etc.) is provided.
4.Locate the AD-4™air dryer on vehicle so that a minimum of 11 inches (28 cm) clearance below the end cover is available to allow servicing. Alternatively, provide access to the bracket bolts so the unit may be removed for servicing.
5.When choosing the mounting location for the AD-4™air dryer, note the discharge line length requirements stated under the heading Connecting the Air Lines, elsewhere in this instruction sheet.
Important Note: Under normal operating conditions, the maximum inlet air temperature for the AD-4™air dryer is 160 degrees Fahrenheit.
MOUNTING THE AD-4™AIR DRYER
1.Assemble the mounting strap and mounting bracket as illustrated in Figures 5 & 6 using the 5/16" screws, nuts and lock washers. Make certain the mounting bracket hook is installed on the 5/16" screw of the lower mounting bracket and that it engages theAD-4™air dryer end cover. Make certain that the inside surface of the top mounting strap bears entirely on the cylindrical surface of the dryer shell and that it does not overlap the domed top. The brackets should be a minimum of 5.5 inches apart. After positioning the mounting straps according to the installation requirements, torque both 5/16" screws to 80-120 inch pounds.
Note: The mounting bracket at the base of the AD-4™air dryer can be of two types. The one described above or a single piece right angle bracket. (See Figure 7.) To install the single piece lower mounting bracket, remove and discard two of the bolts and nuts that retain the end cover. Install the lower mounting bracket as shown in Figure 7. Utilizing the bolts and lock nuts provided with
the bracket and placing the washers removed in proper sequence, torque to 270-330 inch pounds. To determine which end cover bolts to utilize to attach the bracket, take into consideration the piping connections required to install the AD-4™air dryer and use those that will best position the unit for ease of installation.
2.A universal mounting plate (Pc. No. 248478) is available to facilitate the mounting of the AD-4™air dryer. It is not included in kits but can be obtained through an authorized Bendix parts outlet.
3.Use 3/8" bolts (grade 5 min.) and washers (not furnished) to mount the AD-4™air dryer to the vehicle. Torque to 25 ft. Ibs. (300 inch pounds).
CONNECTING THE AIR LINES
PURGE CONTROL LINE
1.Install a purge control air line having a minimum inside diameter of 3/16 inches between the AD-4™air dryer end cover control port and an unused unloader port on the governor. The control line must be plumbed direct to the governor and not in series with automatic drain valves, lubrication systems, etc.
2.The control line should slope downward to the end cover without forming potential water traps.
DISCHARGE LINE
General:
Refer to Appendix A, Table A for recommended discharge line lengths and sizes for various vehicle applications and vocations.
PURGE EXHAUST LINE
1.If it is necessary to direct AD-4™air dryer discharge contaminants away from vehicle components a 1.5 inch (38.1 mm) I.D. hose can be clamped on the AD-4™air dryer exhaust cover.
WIRING THE HEATER/THERMOSTAT
1.Note the required voltage and wattage for the AD-4™air dryer heater by checking the end cover as shown in Figure 8.
2.Remove the rubber boot covering the single electrical terminal of the standard AD-4™air dryer end cover. Install a 16 gauge wire between the “on” position of the vehicle ignition or engine “kill” switch and the heater/thermostat electrical terminal. An 8-10 amp fuse is required in this line regardless of voltage.
